hcl interface to cty function
This commit is contained in:
Alex Dadgar
parent
720cc4d90c
commit
d6b291b00d
69
plugins/shared/util.go
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69
plugins/shared/util.go
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@ -0,0 +1,69 @@
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package shared
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import (
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"bytes"
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"fmt"
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hjson "github.com/hashicorp/hcl2/hcl/json"
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"github.com/hashicorp/nomad/nomad/structs"
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"github.com/ugorji/go/codec"
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"github.com/hashicorp/hcl2/hcl"
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"github.com/hashicorp/hcl2/hcldec"
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"github.com/zclconf/go-cty/cty"
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"github.com/zclconf/go-cty/cty/function"
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"github.com/zclconf/go-cty/cty/function/stdlib"
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)
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// ParseHclInterface is used to convert an interface value representing a hcl2
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// body and return the interpolated value.
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func ParseHclInterface(val interface{}, spec hcldec.Spec, ctx *hcl.EvalContext) (cty.Value, hcl.Diagnostics) {
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// Encode to json
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var buf bytes.Buffer
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enc := codec.NewEncoder(&buf, structs.JsonHandle)
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err := enc.Encode(val)
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if err != nil {
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// Convert to a hcl diagnostics message
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return cty.NilVal, hcl.Diagnostics([]*hcl.Diagnostic{
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{
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Severity: hcl.DiagError,
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Summary: "Failed to JSON encode value",
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Detail: fmt.Sprintf("JSON encoding failed: %v", err),
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}})
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}
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// Parse the json as hcl2
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hclFile, diag := hjson.Parse(buf.Bytes(), "")
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if diag.HasErrors() {
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return cty.NilVal, diag
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}
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value, decDiag := hcldec.Decode(hclFile.Body, spec, ctx)
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diag = diag.Extend(decDiag)
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if diag.HasErrors() {
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return cty.NilVal, diag
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}
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return value, diag
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}
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// GetStdlibFuncs returns the set of stdlib functions.
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func GetStdlibFuncs() map[string]function.Function {
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return map[string]function.Function{
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"abs": stdlib.AbsoluteFunc,
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"coalesce": stdlib.CoalesceFunc,
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"concat": stdlib.ConcatFunc,
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"hasindex": stdlib.HasIndexFunc,
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"int": stdlib.IntFunc,
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"jsondecode": stdlib.JSONDecodeFunc,
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"jsonencode": stdlib.JSONEncodeFunc,
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"length": stdlib.LengthFunc,
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"lower": stdlib.LowerFunc,
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"max": stdlib.MaxFunc,
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"min": stdlib.MinFunc,
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"reverse": stdlib.ReverseFunc,
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"strlen": stdlib.StrlenFunc,
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"substr": stdlib.SubstrFunc,
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"upper": stdlib.UpperFunc,
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}
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}
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692
plugins/shared/util_test.go
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692
plugins/shared/util_test.go
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@ -0,0 +1,692 @@
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package shared
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import (
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"testing"
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"github.com/hashicorp/hcl"
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"github.com/hashicorp/hcl/hcl/ast"
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"github.com/hashicorp/hcl2/gohcl"
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hcl2 "github.com/hashicorp/hcl2/hcl"
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"github.com/hashicorp/hcl2/hcldec"
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"github.com/hashicorp/hcl2/hclparse"
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"github.com/hashicorp/nomad/helper"
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"github.com/hashicorp/nomad/nomad/structs"
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"github.com/kr/pretty"
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"github.com/mitchellh/mapstructure"
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"github.com/stretchr/testify/require"
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"github.com/ugorji/go/codec"
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"github.com/zclconf/go-cty/cty"
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"github.com/zclconf/go-cty/cty/gocty"
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)
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/*
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Martin suggests writing a function that takes a spec and map[string]interface{}
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and essentially fixes the []map[string]interface{} -> map[string]interface{}
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*/
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var (
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dockerSpec hcldec.Spec = hcldec.ObjectSpec(map[string]hcldec.Spec{
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"image": &hcldec.AttrSpec{
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Name: "image",
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Type: cty.String,
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Required: true,
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},
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"args": &hcldec.AttrSpec{
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Name: "args",
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Type: cty.List(cty.String),
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},
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"pids_limit": &hcldec.AttrSpec{
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Name: "pids_limit",
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Type: cty.Number,
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},
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"port_map": &hcldec.AttrSpec{
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Name: "port_map",
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// This should be a block. cty.Map(cty.String)
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Type: cty.List(cty.Map(cty.String)),
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},
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"devices": &hcldec.BlockListSpec{
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TypeName: "devices",
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Nested: hcldec.ObjectSpec(map[string]hcldec.Spec{
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"host_path": &hcldec.AttrSpec{
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Name: "host_path",
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Type: cty.String,
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},
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"container_path": &hcldec.AttrSpec{
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Name: "container_path",
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Type: cty.String,
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},
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"cgroup_permissions": &hcldec.DefaultSpec{
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Primary: &hcldec.AttrSpec{
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Name: "cgroup_permissions",
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Type: cty.String,
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},
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Default: &hcldec.LiteralSpec{
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Value: cty.StringVal(""),
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},
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},
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}),
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},
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},
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)
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)
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type dockerConfig struct {
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Image string `cty:"image"`
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Args []string `cty:"args"`
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PidsLimit *int64 `cty:"pids_limit"`
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PortMap []map[string]string `cty:"port_map"`
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Devices []DockerDevice `cty:"devices"`
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}
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type DockerDevice struct {
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HostPath string `cty:"host_path"`
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ContainerPath string `cty:"container_path"`
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CgroupPermissions string `cty:"cgroup_permissions"`
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}
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func hclConfigToInterface(t *testing.T, config string) interface{} {
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t.Helper()
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// Parse as we do in the jobspec parser
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root, err := hcl.Parse(config)
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if err != nil {
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t.Fatalf("failed to hcl parse the config: %v", err)
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}
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// Top-level item should be a list
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list, ok := root.Node.(*ast.ObjectList)
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if !ok {
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t.Fatalf("root should be an object")
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}
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var m map[string]interface{}
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if err := hcl.DecodeObject(&m, list.Items[0]); err != nil {
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t.Fatalf("failed to decode object: %v", err)
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}
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var m2 map[string]interface{}
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if err := mapstructure.WeakDecode(m, &m2); err != nil {
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t.Fatalf("failed to weak decode object: %v", err)
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}
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return m2["config"]
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}
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func jsonConfigToInterface(t *testing.T, config string) interface{} {
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t.Helper()
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// Decode from json
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dec := codec.NewDecoderBytes([]byte(config), structs.JsonHandle)
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var m map[string]interface{}
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err := dec.Decode(&m)
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if err != nil {
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t.Fatalf("failed to decode: %v", err)
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}
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return m["Config"]
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}
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func TestParseHclInterface_Hcl(t *testing.T) {
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defaultCtx := &hcl2.EvalContext{
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Functions: GetStdlibFuncs(),
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}
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variableCtx := &hcl2.EvalContext{
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Functions: GetStdlibFuncs(),
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Variables: map[string]cty.Value{
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"NOMAD_ALLOC_INDEX": cty.NumberIntVal(2),
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"NOMAD_META_hello": cty.StringVal("world"),
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},
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}
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// XXX Useful for determining what cty thinks the type is
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//implied, err := gocty.ImpliedType(&dockerConfig{})
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//if err != nil {
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//t.Fatalf("implied type failed: %v", err)
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//}
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//t.Logf("Implied type: %v", implied.GoString())
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cases := []struct {
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name string
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config interface{}
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spec hcldec.Spec
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ctx *hcl2.EvalContext
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expected interface{}
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expectedType interface{}
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}{
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{
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name: "single string attr",
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config: hclConfigToInterface(t, `
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config {
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image = "redis:3.2"
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}`),
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spec: dockerSpec,
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ctx: defaultCtx,
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expected: &dockerConfig{
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Image: "redis:3.2",
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Devices: []DockerDevice{},
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},
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expectedType: &dockerConfig{},
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},
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{
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name: "single string attr json",
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config: jsonConfigToInterface(t, `
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{
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"Config": {
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"image": "redis:3.2"
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}
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}`),
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spec: dockerSpec,
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ctx: defaultCtx,
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expected: &dockerConfig{
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Image: "redis:3.2",
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Devices: []DockerDevice{},
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},
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expectedType: &dockerConfig{},
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},
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// ------------------------------------------------
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{
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name: "number attr",
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config: hclConfigToInterface(t, `
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config {
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image = "redis:3.2"
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pids_limit = 2
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}`),
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spec: dockerSpec,
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ctx: defaultCtx,
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expected: &dockerConfig{
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Image: "redis:3.2",
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PidsLimit: helper.Int64ToPtr(2),
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Devices: []DockerDevice{},
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},
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expectedType: &dockerConfig{},
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},
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{
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name: "number attr json",
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config: jsonConfigToInterface(t, `
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{
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"Config": {
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"image": "redis:3.2",
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"pids_limit": "2"
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}
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}`),
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spec: dockerSpec,
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ctx: defaultCtx,
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expected: &dockerConfig{
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Image: "redis:3.2",
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PidsLimit: helper.Int64ToPtr(2),
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Devices: []DockerDevice{},
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},
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expectedType: &dockerConfig{},
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},
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// ------------------------------------------------
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{
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name: "number attr interpolated",
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config: hclConfigToInterface(t, `
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config {
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image = "redis:3.2"
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pids_limit = "${2 + 2}"
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}`),
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spec: dockerSpec,
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ctx: defaultCtx,
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expected: &dockerConfig{
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Image: "redis:3.2",
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PidsLimit: helper.Int64ToPtr(4),
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Devices: []DockerDevice{},
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},
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expectedType: &dockerConfig{},
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},
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{
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name: "number attr interploated json",
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config: jsonConfigToInterface(t, `
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{
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"Config": {
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"image": "redis:3.2",
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"pids_limit": "${2 + 2}"
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}
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}`),
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spec: dockerSpec,
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ctx: defaultCtx,
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expected: &dockerConfig{
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Image: "redis:3.2",
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PidsLimit: helper.Int64ToPtr(4),
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Devices: []DockerDevice{},
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},
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expectedType: &dockerConfig{},
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},
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// ------------------------------------------------
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{
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name: "multi attr",
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config: hclConfigToInterface(t, `
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config {
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image = "redis:3.2"
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args = ["foo", "bar"]
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}`),
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spec: dockerSpec,
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ctx: defaultCtx,
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expected: &dockerConfig{
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Image: "redis:3.2",
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Args: []string{"foo", "bar"},
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Devices: []DockerDevice{},
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},
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expectedType: &dockerConfig{},
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},
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{
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name: "multi attr json",
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config: jsonConfigToInterface(t, `
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{
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"Config": {
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"image": "redis:3.2",
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"args": ["foo", "bar"]
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}
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}`),
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spec: dockerSpec,
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ctx: defaultCtx,
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expected: &dockerConfig{
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Image: "redis:3.2",
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Args: []string{"foo", "bar"},
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Devices: []DockerDevice{},
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},
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expectedType: &dockerConfig{},
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},
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// ------------------------------------------------
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{
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name: "multi attr variables",
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config: hclConfigToInterface(t, `
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config {
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image = "redis:3.2"
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args = ["${NOMAD_META_hello}", "${NOMAD_ALLOC_INDEX}"]
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pids_limit = "${NOMAD_ALLOC_INDEX + 2}"
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}`),
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spec: dockerSpec,
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ctx: variableCtx,
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expected: &dockerConfig{
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Image: "redis:3.2",
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Args: []string{"world", "2"},
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PidsLimit: helper.Int64ToPtr(4),
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Devices: []DockerDevice{},
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},
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expectedType: &dockerConfig{},
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},
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{
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name: "multi attr variables json",
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config: jsonConfigToInterface(t, `
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{
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"Config": {
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"image": "redis:3.2",
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"args": ["foo", "bar"]
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}
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}`),
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spec: dockerSpec,
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ctx: defaultCtx,
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expected: &dockerConfig{
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Image: "redis:3.2",
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Args: []string{"foo", "bar"},
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Devices: []DockerDevice{},
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},
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expectedType: &dockerConfig{},
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},
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// ------------------------------------------------
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{
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name: "port_map",
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config: hclConfigToInterface(t, `
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config {
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image = "redis:3.2"
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port_map {
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foo = "db"
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bar = "db2"
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}
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}`),
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spec: dockerSpec,
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ctx: defaultCtx,
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expected: &dockerConfig{
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Image: "redis:3.2",
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PortMap: []map[string]string{
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{
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"foo": "db",
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"bar": "db2",
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}},
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Devices: []DockerDevice{},
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},
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expectedType: &dockerConfig{},
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},
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{
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name: "port_map json",
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config: jsonConfigToInterface(t, `
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{
|
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"Config": {
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"image": "redis:3.2",
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"port_map": [{
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"foo": "db",
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"bar": "db2"
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}]
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}
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}`),
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spec: dockerSpec,
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ctx: defaultCtx,
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expected: &dockerConfig{
|
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Image: "redis:3.2",
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PortMap: []map[string]string{
|
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{
|
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"foo": "db",
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"bar": "db2",
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}},
|
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Devices: []DockerDevice{},
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},
|
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expectedType: &dockerConfig{},
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},
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// ------------------------------------------------
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/*
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{
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name: "port_map non-list json",
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config: jsonConfigToInterface(t, `
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{
|
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"Config": {
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"image": "redis:3.2",
|
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"port_map": {
|
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"foo": "db",
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"bar": "db2"
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}
|
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}
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}`),
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spec: dockerSpec,
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ctx: defaultCtx,
|
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expected: &dockerConfig{
|
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Image: "redis:3.2",
|
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PortMap: []map[string]string{
|
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{
|
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"foo": "db",
|
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"bar": "db2",
|
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}},
|
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Devices: []DockerDevice{},
|
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},
|
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expectedType: &dockerConfig{},
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},
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*/
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// ------------------------------------------------
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{
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name: "devices",
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config: hclConfigToInterface(t, `
|
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config {
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image = "redis:3.2"
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devices = [
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{
|
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host_path = "/dev/sda1"
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container_path = "/dev/xvdc"
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cgroup_permissions = "r"
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},
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{
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host_path = "/dev/sda2"
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container_path = "/dev/xvdd"
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}
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]
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}`),
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spec: dockerSpec,
|
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ctx: defaultCtx,
|
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expected: &dockerConfig{
|
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Image: "redis:3.2",
|
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Devices: []DockerDevice{
|
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{
|
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HostPath: "/dev/sda1",
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ContainerPath: "/dev/xvdc",
|
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CgroupPermissions: "r",
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},
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{
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HostPath: "/dev/sda2",
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ContainerPath: "/dev/xvdd",
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},
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},
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},
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expectedType: &dockerConfig{},
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},
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{
|
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name: "devices json",
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config: jsonConfigToInterface(t, `
|
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{
|
||||
"Config": {
|
||||
"image": "redis:3.2",
|
||||
"devices": [
|
||||
{
|
||||
"host_path": "/dev/sda1",
|
||||
"container_path": "/dev/xvdc",
|
||||
"cgroup_permissions": "r"
|
||||
},
|
||||
{
|
||||
"host_path": "/dev/sda2",
|
||||
"container_path": "/dev/xvdd"
|
||||
}
|
||||
]
|
||||
}
|
||||
}`),
|
||||
spec: dockerSpec,
|
||||
ctx: defaultCtx,
|
||||
expected: &dockerConfig{
|
||||
Image: "redis:3.2",
|
||||
Devices: []DockerDevice{
|
||||
{
|
||||
HostPath: "/dev/sda1",
|
||||
ContainerPath: "/dev/xvdc",
|
||||
CgroupPermissions: "r",
|
||||
},
|
||||
{
|
||||
HostPath: "/dev/sda2",
|
||||
ContainerPath: "/dev/xvdd",
|
||||
},
|
||||
},
|
||||
},
|
||||
expectedType: &dockerConfig{},
|
||||
},
|
||||
// ------------------------------------------------
|
||||
}
|
||||
|
||||
for _, c := range cases {
|
||||
t.Run(c.name, func(t *testing.T) {
|
||||
t.Logf("Val: % #v", pretty.Formatter(c.config))
|
||||
// Parse the interface
|
||||
ctyValue, diag := ParseHclInterface(c.config, c.spec, c.ctx)
|
||||
if diag.HasErrors() {
|
||||
for _, err := range diag.Errs() {
|
||||
t.Error(err)
|
||||
}
|
||||
t.FailNow()
|
||||
}
|
||||
|
||||
// Convert cty-value to go structs
|
||||
require.NoError(t, gocty.FromCtyValue(ctyValue, c.expectedType))
|
||||
|
||||
require.EqualValues(t, c.expected, c.expectedType)
|
||||
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
// -------------------------------------------------------------------------
|
||||
|
||||
var (
|
||||
dockerSpec2 hcldec.Spec = hcldec.ObjectSpec(map[string]hcldec.Spec{
|
||||
"image": &hcldec.AttrSpec{
|
||||
Name: "image",
|
||||
Type: cty.String,
|
||||
Required: true,
|
||||
},
|
||||
"args": &hcldec.AttrSpec{
|
||||
Name: "args",
|
||||
Type: cty.List(cty.String),
|
||||
},
|
||||
//"port_map": &hcldec.AttrSpec{
|
||||
//Name: "port_map",
|
||||
//Type: cty.List(cty.Map(cty.String)),
|
||||
//},
|
||||
|
||||
//"devices": &hcldec.AttrSpec{
|
||||
//Name: "devices",
|
||||
//Type: cty.List(cty.Object(map[string]cty.Type{
|
||||
//"host_path": cty.String,
|
||||
//"container_path": cty.String,
|
||||
//"cgroup_permissions": cty.String,
|
||||
//})),
|
||||
//Type: cty.Tuple([]cty.Type{cty.Object(map[string]cty.Type{
|
||||
//"host_path": cty.String,
|
||||
//"container_path": cty.String,
|
||||
//"cgroup_permissions": cty.String,
|
||||
//})}),
|
||||
//},
|
||||
},
|
||||
)
|
||||
)
|
||||
|
||||
func configToHcl2Interface(t *testing.T, config string) interface{} {
|
||||
t.Helper()
|
||||
|
||||
// Parse as we do in the jobspec parser
|
||||
file, diag := hclparse.NewParser().ParseHCL([]byte(config), "config")
|
||||
if diag.HasErrors() {
|
||||
t.Fatalf("failed to hcl parse the config: %v", diag.Error())
|
||||
}
|
||||
|
||||
//t.Logf("Body: % #v", pretty.Formatter(file.Body))
|
||||
|
||||
var c struct {
|
||||
m map[string]interface{}
|
||||
}
|
||||
implied, partial := gohcl.ImpliedBodySchema(&c)
|
||||
t.Logf("partial=%v implied=% #v", partial, pretty.Formatter(implied))
|
||||
|
||||
contents, diag := file.Body.Content(implied)
|
||||
if diag.HasErrors() {
|
||||
t.Fatalf("failed to get contents: %v", diag.Error())
|
||||
}
|
||||
|
||||
t.Fatalf("content=% #v", pretty.Formatter(contents))
|
||||
|
||||
//defaultCtx := &hcl2.EvalContext{
|
||||
//Functions: GetStdlibFuncs(),
|
||||
//}
|
||||
return nil
|
||||
}
|
||||
|
||||
func TestParseHclInterface_Hcl2(t *testing.T) {
|
||||
t.SkipNow()
|
||||
|
||||
defaultCtx := &hcl2.EvalContext{
|
||||
Functions: GetStdlibFuncs(),
|
||||
}
|
||||
|
||||
cases := []struct {
|
||||
name string
|
||||
config string
|
||||
spec hcldec.Spec
|
||||
ctx *hcl2.EvalContext
|
||||
expected interface{}
|
||||
expectedType interface{}
|
||||
}{
|
||||
{
|
||||
name: "single attr",
|
||||
config: `
|
||||
image = "redis:3.2"
|
||||
`,
|
||||
spec: dockerSpec2,
|
||||
ctx: defaultCtx,
|
||||
expected: &dockerConfig{
|
||||
Image: "redis:3.2",
|
||||
},
|
||||
expectedType: &dockerConfig{},
|
||||
},
|
||||
//{
|
||||
//name: "multi attr",
|
||||
//config: `
|
||||
//config {
|
||||
//image = "redis:3.2"
|
||||
//args = ["foo", "bar"]
|
||||
//}`,
|
||||
//spec: dockerSpec2,
|
||||
//ctx: defaultCtx,
|
||||
//expected: &dockerConfig{
|
||||
//Image: "redis:3.2",
|
||||
//Args: []string{"foo", "bar"},
|
||||
//},
|
||||
//expectedType: &dockerConfig{},
|
||||
//},
|
||||
//{
|
||||
//name: "port_map",
|
||||
//config: `
|
||||
//config {
|
||||
//image = "redis:3.2"
|
||||
//port_map {
|
||||
//foo = "db"
|
||||
//}
|
||||
//}`,
|
||||
//spec: dockerSpec,
|
||||
//ctx: defaultCtx,
|
||||
//expected: &dockerConfig{
|
||||
//Image: "redis:3.2",
|
||||
//PortMap: []map[string]string{{"foo": "db"}},
|
||||
//},
|
||||
//expectedType: &dockerConfig{},
|
||||
//},
|
||||
|
||||
//{
|
||||
//name: "devices",
|
||||
//config: `
|
||||
//config {
|
||||
//image = "redis:3.2"
|
||||
//devices = [
|
||||
//{
|
||||
//host_path = "/dev/sda1"
|
||||
//container_path = "/dev/xvdc"
|
||||
//cgroup_permissions = "r"
|
||||
//},
|
||||
//{
|
||||
//host_path = "/dev/sda2"
|
||||
//container_path = "/dev/xvdd"
|
||||
//}
|
||||
//]
|
||||
//}`,
|
||||
//spec: dockerSpec,
|
||||
//ctx: defaultCtx,
|
||||
//expected: &dockerConfig{
|
||||
//Image: "redis:3.2",
|
||||
//Args: []string{"foo", "bar"},
|
||||
//Devices: []DockerDevice{
|
||||
//{
|
||||
//HostPath: "/dev/sda1",
|
||||
//ContainerPath: "/dev/xvdc",
|
||||
//CgroupPermissions: "r",
|
||||
//},
|
||||
//{
|
||||
//HostPath: "/dev/sda2",
|
||||
//ContainerPath: "/dev/xvdd",
|
||||
//},
|
||||
//},
|
||||
//},
|
||||
//expectedType: &dockerConfig{},
|
||||
//},
|
||||
}
|
||||
|
||||
for _, c := range cases {
|
||||
t.Run(c.name, func(t *testing.T) {
|
||||
// Convert the config to a value
|
||||
v := configToHcl2Interface(t, c.config)
|
||||
t.Logf("value: % #v", pretty.Formatter(v))
|
||||
|
||||
// Parse the interface
|
||||
ctyValue, diag := ParseHclInterface(v, c.spec, c.ctx)
|
||||
if diag.HasErrors() {
|
||||
for _, err := range diag.Errs() {
|
||||
t.Error(err)
|
||||
}
|
||||
t.FailNow()
|
||||
}
|
||||
|
||||
// Convert cty-value to go structs
|
||||
require.NoError(t, gocty.FromCtyValue(ctyValue, c.expectedType))
|
||||
|
||||
require.EqualValues(t, c.expected, c.expectedType)
|
||||
|
||||
})
|
||||
}
|
||||
}
|
||||
Loading…
Reference in a new issue